/*
 * @(#)MimeLauncher.java	1.35 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.  
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
 *   
 * This program is free software; you can redistribute it and/or  
 * modify it under the terms of the GNU General Public License version  
 * 2 only, as published by the Free Software Foundation.   
 *   
 * This program is distributed in the hope that it will be useful, but  
 * WITHOUT ANY WARRANTY; without even the implied warranty of  
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  
 * General Public License version 2 for more details (a copy is  
 * included at /legal/license.txt).   
 *   
 * You should have received a copy of the GNU General Public License  
 * version 2 along with this work; if not, write to the Free Software  
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  
 * 02110-1301 USA   
 *   
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa  
 * Clara, CA 95054 or visit www.sun.com if you need additional  
 * information or have any questions. 
 *
 */

package sun.net.www;
import java.net.URL;
import java.io.*;
import java.util.StringTokenizer;

class MimeLauncher extends Thread {
    java.net.URLConnection uc;
    MimeEntry m;
    String genericTempFileTemplate;
    InputStream is;
    String execPath;

    MimeLauncher (MimeEntry M, java.net.URLConnection uc,
		  InputStream is, String tempFileTemplate, String threadName) throws ApplicationLaunchException {
	super(threadName);
	m = M;
	this.uc = uc;
	this.is = is;
	genericTempFileTemplate = tempFileTemplate;

	/* get the application to launch */
	String launchString = m.getLaunchString();

	/* get a valid path to launch application - sets
	   the execPath instance variable with the correct path.
	 */
	if (!findExecutablePath(launchString)) {
	    /* strip off parameters i.e %s */
	    String appName;
	    int index = launchString.indexOf(' ');
	    if (index != -1) {
		appName = launchString.substring(0, index);
	    }
	    else {
		appName = launchString;
	    }
	    throw new ApplicationLaunchException(appName);
	}
    }

    protected String getTempFileName(URL url, String template) {
	String tempFilename = template;

	// Replace all but last occurrance of "%s" with timestamp to insure
	// uniqueness.  There's a subtle behavior here: if there is anything
	// _after_ the last "%s" we need to append it so that unusual launch
	// strings that have the datafile in the middle can still be used.
	int wildcard = tempFilename.lastIndexOf("%s");
	String prefix = tempFilename.substring(0, wildcard);

	String suffix = "";
	if (wildcard < tempFilename.length() - 2) {
	    suffix = tempFilename.substring(wildcard + 2);
	}

	long timestamp = System.currentTimeMillis()/1000;
	int argIndex = 0;
	while ((argIndex = prefix.indexOf("%s")) >= 0) {
	    prefix = prefix.substring(0, argIndex)
		+ timestamp
                + prefix.substring(argIndex + 2);
	}

	// Add a file name and file-extension if known
	String filename = url.getFile();

	String extension = "";
	int dot = filename.lastIndexOf('.');

	// BugId 4084826:  Temp MIME file names not always valid.
	// Fix:  don't allow slashes in the file name or extension.
	if (dot >= 0 && dot > filename.lastIndexOf('/')) {
	    extension = filename.substring(dot);
	}

	filename = "HJ" + url.hashCode();

	tempFilename = prefix + filename + timestamp + extension + suffix;

	return tempFilename;
    }

    public void run() {
	try {
	    String ofn = m.getTempFileTemplate();
	    if (ofn == null) {
		ofn = genericTempFileTemplate;
	    }

	    ofn = getTempFileName(uc.getURL(), ofn);
	    try {
		OutputStream os = new FileOutputStream(ofn);
		byte buf[] = new byte[2048];
		int i = 0;
		try {
		    while ((i = is.read(buf)) >= 0) {
			os.write(buf, 0, i);
		    }
		} catch(IOException e) {
		  //System.err.println("Exception in write loop " + i);
		  //e.printStackTrace();
		} finally {
		    os.close();
		    is.close();
		}
	    } catch(IOException e) {
	      //System.err.println("Exception in input or output stream");
	      //e.printStackTrace();
	    }

	    int inx = 0;
	    String c = execPath;
	    while ((inx = c.indexOf("%t")) >= 0) {
		c = c.substring(0, inx) + uc.getContentType()
		    + c.substring(inx + 2);
	    }

	    boolean substituted = false;
	    while ((inx = c.indexOf("%s")) >= 0) {
		c = c.substring(0, inx) + ofn + c.substring(inx + 2);
		substituted = true;
	    }
	    if (!substituted)
		c = c + " <" + ofn;

	    // System.out.println("Execing " +c);

	    Runtime.getRuntime().exec(c);
	} catch(IOException e) {
	}
    }

    /* This method determines the path for the launcher application
       and sets the execPath instance variable.  It uses the exec.path
       property to obtain a list of paths that is in turn used to
       location the application.  If a valid path is not found, it
       returns false else true.  */
    private boolean findExecutablePath(String str) {
	if (str == null || str.length() == 0) {
	    return false;
	}

	String command;
	int index = str.indexOf(' ');
	if (index != -1) {
	    command = str.substring(0, index);
	}
	else {
	    command = str;
	}

	File f = new File(command);
	if (f.isFile()) {
	    // Already executable as it is
	    execPath = str;
	    return true;
	}

	String execPathList;
	execPathList = (String) java.security.AccessController.doPrivileged(
                new sun.security.action.GetPropertyAction("exec.path"));
	if (execPathList == null) {
	    // exec.path property not set
	    return false;
	}

	StringTokenizer iter = new StringTokenizer(execPathList, "|");
	while (iter.hasMoreElements()) {
	    String prefix = (String)iter.nextElement();
	    String fullCmd = prefix + File.separator + command;
	    f = new File(fullCmd);
	    if (f.isFile()) {
		execPath = prefix + File.separator + str;
		return true;
	    }
	}

	return false; // application not found in exec.path
    }
}
